Hmmm......
Two pairs of belt less pants (One Officials Choice, one Sansa Belt)
One Pair of old NON-belt less pants (my original when I started reffing high school. It's still in decent shape but I didn't wear it for a long time. It might find new life as my volleyball pants until it wears down.
A few different pairs of shoes for reffing.
Two shirts I use for the Catholic Grammar school league I work in
Three shirts for the rest of my games.